diff --git a/include/common/hashpjw.h b/include/common/hashpjw.h
new file mode 100644
index 0000000..99a3ad7
--- /dev/null
+++ b/include/common/hashpjw.h
@@ -0,0 +1,38 @@
+/*
+  This File is copied from
+  
+  http://www.oreilly.com/catalog/masteralgoc/index.html
+  Mastering Algorithms with C
+  By Kyle Loudon
+  ISBN: 1-56592-453-3
+  Publishd by O'Reilly
+
+  We have added our own struct to these function.
+ */
+
+/*****************************************************************************
+*                                                                            *
+*  ------------------------------- hashpjw.h ------------------------------  *
+*                                                                            *
+*****************************************************************************/
+
+#ifndef _COMMON_HASHPJW_H
+#define _COMMON_HASHPJW_H
+
+/*****************************************************************************
+*                                                                            *
+*  Define a table size for demonstration purposes only.                      *
+*                                                                            *
+*****************************************************************************/
+
+#define            PRIME_TBLSIZ       1699
+
+/*****************************************************************************
+*                                                                            *
+*  --------------------------- Public Interface ---------------------------  *
+*                                                                            *
+*****************************************************************************/
+
+int hashpjw(const void *key);
+
+#endif /* _COMMON_HASHPJW_H */